std::char_traits::length, std::char_traits::length, std::char_traits::length, std::char_traits::length, std::char_traits::length (original) (raw)

| static std::size_t length( const char_type* s ); | | (constexpr since C++17) | | -------------------------------------------------------------------------------- | | ----------------------- |

Returns the length of the character sequence pointed to by s, that is, the position of the terminating null character (char_type()).

See CharTraits for the general requirements on character traits for X::length.

[edit] Parameters

[edit] Return value

The length of character sequence pointed to by s.

[edit] Complexity

Linear.

[edit] Example

#include #include #include   void print(const char* str) { std::cout << std::quoted(str) << " has length = " << std::char_traits::length(str) << '\n'; }   int main() { print("foo");   std::string s{"booo"}; print(s.c_str()); }

Output:

"foo" has length = 3 "booo" has length = 4